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Spatial variations in denitrification activity in wetland sediments explained by hydrology and denitrifying community structure
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2007 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 41, no 20, 4710-4720 p.Article in journal (Refereed) Published
Abstract [en]

We determined spatial variations in potential denitrification activity and the controlling hydrological as well as biochemical processes in the sediments of a Swedish treatment wetland. Hydrological processes, including water residence times, were analyzed using a 2D depth-averaged flow model and the denitrifier community structure was analyzed using denaturing gradient gel electrophoreses (DGGE) of nosZ genes, encoding nitrous oxide reductase. In addition, we provide a theoretical basis for evaluation of denitrification rates useful in nitrate-limited conditions. The results demonstrate that potential denitrification rates differed significantly between the sampling locations (CV=0.34). The variations were best described by concentration of nitrogen in sediments and water residence time. DGGE analyses indicated that a few key populations dominated and that the community diversity increased with decreasing nutrient levels and increasing water residence times. Moreover, we found that denitrification rates in terms of Menten and first-order kinetics can be evaluated by fitting a mathematical expression, comparing denitrification and other nitrogen-transforming processes to measured product formation in nitrate-limited experiments.

Place, publisher, year, edition, pages
2007. Vol. 41, no 20, 4710-4720 p.
Keyword [en]
Bacterial community, Denitrification, DGGE, Model, NosZ, Water residence time, Wetland
National Category
Oceanography, Hydrology, Water Resources
Identifiers
URN: urn:nbn:se:kth:diva-7082DOI: 10.1016/j.watres.2007.06.053ISI: 000251627300014Scopus ID: 2-s2.0-36049035934OAI: oai:DiVA.org:kth-7082DiVA: diva2:11988
Note
QC 20100930. Uppdaterad från Submitted till Published (20100930).Available from: 2007-05-14 Created: 2007-05-14 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Coupled Hydrological and Microbiological Processes Controlling Denitrification in Constructed Wetlands
Open this publication in new window or tab >>Coupled Hydrological and Microbiological Processes Controlling Denitrification in Constructed Wetlands
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Treatment wetlands play an important role in reducing nitrogen content in wastewater and agricultural run-off water. The main removal process is denitrification and the removal efficiency depends on the hydrological and microbiological features of the wetland, especially in terms of water residence times and denitrification rates. The aim of this thesis was to increase the understanding of the coupled hydrological and microbiological processes regulating the denitrification capacity. This was done by applying a broad spectrum of analyses methods, including tracer experiment, water flow modeling, denitrification rate measurements, and analyses of the microbial community structures. The tracer experiment and flow modeling revealed that the wetland design, especially the vegetation, largely can affect the water residence time distributions in wetlands. In the investigated wetland, vegetation dominated the water flow, explaining 60-80% of the variance in water residence times, whereas basin shape only explained about 10% of the variance, but also mixing phenomena significantly affected the residence times and could considerably delay solutes. Measured potential denitrification rates in the wetland exhibited significant spatial variations, and the variations were best described by concentration of nitrogen in sediments and water residence time. Analyses of the denitrifying bacteria populations indicated that a few key populations dominated and that the community diversity increased with decreasing nutrient levels and increasing water residence times. Moreover, it was found that denitrification rates in terms of Menten and first order kinetics can be evaluated by fitting a mathematical expression, considering denitrification and other nitrogen transforming processes to measured product formation in nitrate limited experiments.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. x, 20 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2038
Keyword
Constructed wetland, Residence time, water flow modeling, denitrification rate, Tracer experiment, denitrifying bacteria community structure
National Category
Oceanography, Hydrology, Water Resources
Identifiers
urn:nbn:se:kth:diva-4370 (URN)978-91-7178-663-0 (ISBN)
Presentation
2007-05-25, V2, Teknikringen 76, Teknikringen 76, KTH, Stockholm, 13:15
Opponent
Supervisors
Note
QC 20101110Available from: 2007-05-14 Created: 2007-05-14 Last updated: 2010-11-10Bibliographically approved

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